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 Post subject: bulbs
PostPosted: Fri Jul 01, 2016 6:23 am 
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Joined: Sun Feb 21, 2016 8:00 am
Posts: 8
does it matter if tail and parking light are single or double filament ?


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 Post subject: Re: bulbs
PostPosted: Fri Jul 01, 2016 7:03 am 
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Double filament bulbs are for those lights that do two things at once, like being the park light and turn signal, or....being the taillight and turn signal.

Single filament bulbs are for those lights that do only one thing and are either on or off. Examples of this are the overhead dome light and most of the dashboard lights.

So...yes, the tail and park lights need double filaments. If you look inside the park and taillight socket, you'll see that there are two contact points for the bulb. That's because there are two electrical inputs leading to those bulbs. Also, if you look at the bottom of the double filament bulb, you'll see two contact points there as well.

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 Post subject: Re: bulbs
PostPosted: Fri Jul 01, 2016 9:15 am 
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Rustyfords wrote:
Double filament bulbs are for those lights that do two things at once, like being the park light and turn signal, or....being the taillight and turn signal.

Single filament bulbs are for those lights that do only one thing and are either on or off. Examples of this are the overhead dome light and most of the dashboard lights.

So...yes, the tail and park lights need double filaments. If you look inside the park and taillight socket, you'll see that there are two contact points for the bulb. That's because there are two electrical inputs leading to those bulbs. Also, if you look at the bottom of the double filament bulb, you'll see two contact points there as well.


Excellent response Don - very clear. Related: I've got a bad ground somewhere and my right signal triggers both front both bulbs to flash. Dig, dig, dig..... somewhere I'll find it.

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 Post subject: Re: bulbs
PostPosted: Fri Jul 01, 2016 9:21 pm 
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Andy - the bad ground could be the housing itself. Make up a temporary ground wire and attach it to the housing and a good ground spot. If the problem goes away, that is where your problem lies.

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 Post subject: Re: bulbs
PostPosted: Sat Jul 02, 2016 8:46 am 
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It could also be one of the bulbs. A filament breaks and lays over on the other.

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Gary

'54 Skyliner, in progress


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